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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6028b9f767bba5ebdc32901ea1d8725d88da1ed279b96af060287660fa2f4fb2' 
  AND token = 'n7oHKxOmaptXTXtIWRKdOEgYeA5/8cya+FQvsHbSzQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}